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题目材料：
James: Why is it that fish living iii the ocean's dark depths do not swim around very much? It must be that the scarcity of food available there prevents them from having much energy for swimming.
Marie: But fish swim around only to approach or avoid other creatures that they can see. and in such conditions of darkness, almost nothing can be seen.
Marie: But fish swim around only to approach or avoid other creatures that they can see. and in such conditions of darkness, almost nothing can be seen.
以上解析由 考满分老师提供。
